Feature: 1. Applicable Model: This adapter cylinder thread M42x0.75 is suitable for T2 mount lens, and T2 adapter ring is applicable for Nikon SLR camera. 2. Height Diameter Adjusting Valve: The height of eyepiece can be adjusted from 67mm to 80mm. And the diameter of eyepiece can be adjusted from 41.5mm to 44.5mm. 3. Hollow Design: This spotting scope camera adapter tube adopts hollow design, which does not affect the focusing wheel and the adjustment of the focusing hand wheel on both sides. 4. Aluminum Alloy: This T mount spotting scope camera adapter set is made of aluminum alloy, durable and sturdy. And it is alao easy to install, simple and practical. 5. Applicable Scenes: This adapter tube and T ring is suitable for birdwatching spotting scope and SLR camera, which is helpful for visual photography. Specification: Item Type: Spotting Scope Camera Adapter Tube Material: Aluminum Alloy Gross Weight: 183g / 6.5oz Thread: Male Thread M42x0.75mm Adjustable Eyepiece Height: 67-80mm / 2.6-3.1in Adjustable Eyepiece Diameter: 41.5-44.5mm / 1.6-1.8in Scope of Application: Birdwatching binoculars, SLR camera. Package List: 1 x Adapter Tube1 x Adapter Ring